Pressure-releasing device.



D. J. G. ARNOLD.

PRESSURE RELEASING DEVICE.

APPLICATION FILED SEPT. 21, 1911.

1,063,002, Patented May 27, 1913.

Mznes'ses': fm/ezzfar' DANIEL J. G. ARNOLD, OF NEW LONDON, OHIO.

PRESSUBE-RELEASING DEVICE.

' Specification of Letters Patent.

Patented May 27, 1913.

Application filed September 21, 1911. Serial No. 650,489.

To all whom, it may concern.

Be it known that I, DANIEL J. C. ARNOLD, awcitizen of the United States, and resident of New London, in the county of Huron and State of Ohio, have invented certain new and useful Improvements in Pressure- Releasing Devices, of which I hereby declare the following to be a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

The objects of the invention are to pro-. vide means for obtaining release under heavy pressure of the actuating parts of a machine, such as the connecting rod, or

other appliance employed to transmit movement and power to the operating parts of a machine, and the device is specifically provided to relieve such driving member when the machinery becomes clogged or when heavy pressure is otherwise upon the drivin member such that if not released it woul soon become broken. It is particularly applicable for employment in all classes of machinery where the work necessitates heavy pressure, and which are liable to injury when worked beyond the power of the actuating means. Particularly in such classes of machinery as brick ma- 1 3o chines, hay presses, and analogous devices.

The invention comprises a connecting rod, one portion of which is slidable within or upon another portion and a connecting means between the two portions which detachably secures them together until an excess of pressure is encountered beyond the predetermined computed strength of this device, whereupon the connecting means between the parts is automatically released and the parts slide upon each other without transmitting any movement whatsoever. The device also includes means for reconnecting these parts in an operative manner at one end of the stroke. so that the machinery will operate as soon as the obstruction is removed.

The invention specifically comprises a latching member upon one portion provided with a shoulder adapted to engage a corresponding shoulder upon the other portion of the connecting rod. These shoulders have faces inclined at an angle such that the latching member'will be cast oil when a predetermined amount of pressure is exceeded..

The invention also includes tension springs placed 4 adapted to engage the latching member and means for adjusting the pressure upon the spring. 7

Further features of the invention comprise means for adjusting the an lar positions of the said engaging shou ders upon the latching member and connecting rod.

The invention further consists in the combination, and arrangement of the various parts and construction of details as here- .inafter described, shown in the accom any.-

ing drawings and specifically points in the claims.

In the accompanying drawings Figure 1 is a plan view of the improved form of connecting rod showing a member or head in which the connecting rod is slidingly mounted, said head being operatively connected with the crahk; Fig. 2 is a side elevation of the same showing a latching memout ber engaging the cross bar upon the connecting rod pressure applying springs and adjusting Iiuts therefor; Fig. 3 is aside elevation of the same showing the rod repin 4 of the crank 5 operates. The bars 1, 1 of the connecting rod are slidably inserted in the cross bar 3. Upon the cross bar 3 is pivotally secured an elongated latching member 6 which is provided with a shoulder 7 near its outer extremity which is slightly inclined a few degrees froma vertical plane and engages a corresponding shoulder 7 upon a cross bar 8 secured to the rods 1, 1. On the forward stroke of the rod it is also rovided with the oppositely facing shoul er 7 which engages the bar 8 on the return stroke.

9, 9 are studs inserted in the cross bar 8, and 10, 10', are plates through which the 'studs pass and which are separated by the coil springs 11, 11. The lower plate '10 rests upon the latching member and by means of nuts 12, 12 engaging the upper plate 10 the amount of pressure upon the latching member can be adjusted.

cross bar 3 and latching member back into the engaging position shown in Figs. 1 and 2.

In Fig. 5 the engaging shoulders shown are formed with semi-cylindrical bearings 15 and 16 and these bearings are slotted to permit the adjustment of studs 17 and 18 to regulate the angle of elevation of each shoulder. The opposite shoulders 8 can be made without adjustment if desired. When lubrication is employed this angle is less than when the surfaces are not lubricated and the shoulders can be adjusted to release the latching member when any excess of pressure beyond the desired limit is encountered.

It is obvious that this releasing means is applicable to many forms of transmitting devices or elements for ower producing machinery, the essential features of the invention being the formation of the element in two parts slidable on each other, a latch capable of lifting and attached to one of the elements, engaging shoulders on said latch and the other portion of the element on a through which the pin extends, a pair of rods connected together at the outer ends and slidable in said first mentioned cross bar, a cross bar connecting the said rods together intermediate of their lengths, said bar provided with inner and outer shoulders, a latch bar pivoted in said crank pin bar and provided with a recess provided with shoulders engaging the shoulders on said intermediate cross bar and a device for resiliently retaining the said latch bar in engagement 7 bar and connected together at their outer ends, a latch bar pivoted in said pivoted cross bar and provided with a shouldered recess in its outer end, a transverse bar connecting said parallel rods, and engaged by the shoulders on said latch bar, one of the shoulders in said latch bar being-inclined and the corresponding shoulder in the transverse bar having a corresponding inclination, a spring on each side of said latch bar and retaining means therefor secured in said transverse bar.

3. The combination with a crank and crank pin, of a cross bar pivoted on said crank pin, a pair of spaced rods movable in said pivoted cross bar and secured together at their outer ends, a latch bar pivoted in said pivoted cross bar, a transverse liar inter.- mediate of the length of said rods, and provided with engaging shoulders and said latch bar provided with corresponding shoulders,

springs on said transverse bar tending to retain said shoulders on said latch and cross oted cross bar and provided with a front and a rear shoulder, a transverse bar rigidly connecting said rods, and provided with corresponding shoulders, a third shoulder on said transverse bar and a corresponding shoulder on the frame.

In testimony whereof, I hereunto set my hand this 6th day of Sept, 1911.

DANIEL J. C. ARNOLD.

/ In presence of- 'E. M. PALMER, C. L. Ramon. 

